Chi
χ
Type it
| Unicode | U+03C7 | |
|---|---|---|
| LaTeX | \chi | |
| HTML entity | χ | |
| Character | χ |
Meaning
The twenty-second letter of the Greek alphabet. It names the chi-squared distribution, the Euler characteristic, and the indicator function of a set. Compare with Psi and Sigma.
How to read it
χ(S²) = 2
is read “the Euler characteristic of the sphere equals two”.